operator< (multimap)
Tests if the multimap object on the left side of the operator is less than the multimap object on the right side.
bool operator<(
const multimap <Key, Type, Traits, Allocator>& _Left,
const multimap <Key, Type, Traits, Allocator>& _Right
);
_Left
An object of type multimap._Right
An object of type multimap.
true if the multimap on the left side of the operator is strictly less than the multimap on the right side of the operator; otherwise false.
The comparison between multimap objects is based on a pairwise comparison of their elements. The less-than relationship between two objects is based on a comparison of the first pair of unequal elements.
// multimap_op_lt.cpp
// compile with: /EHsc
#include <map>
#include <iostream>
int main( )
{
using namespace std;
multimap < int, int > m1, m2, m3;
int i;
typedef pair < int, int > Int_Pair;
for ( i = 1 ; i < 3 ; i++ )
{
m1.insert ( Int_Pair ( i, i ) );
m2.insert ( Int_Pair ( i, i * i ) );
m3.insert ( Int_Pair ( i, i - 1 ) );
}
if ( m1 < m2 )
cout << "The multimap m1 is less than the multimap m2." << endl;
else
cout << "The multimap m1 is not less than the multimap m2." << endl;
if ( m1 < m3 )
cout << "The multimap m1 is less than the multimap m3." << endl;
else
cout << "The multimap m1 is not less than the multimap m3." << endl;
}
The multimap m1 is less than the multimap m2.
The multimap m1 is not less than the multimap m3.
Header: <map>
Namespace: std